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Automatically merged updates to draft EIP(s) 1108

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Hi, I'm a bot! This change was automatically merged because:

 - It only modifies existing Draft or Last Call EIP(s)
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pdyraga 2018-09-27 00:21:36 +02:00 committed by EIP Automerge Bot
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EIPS/eip-1108.md
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@ -13,8 +13,12 @@ requires: 196, 197
Recent changes to the underlying library used by the official Go reference Recent changes to the underlying library used by the official Go reference
implementation led to significant performance gains for the `ECADD`, `ECMUL`, implementation led to significant performance gains for the `ECADD`, `ECMUL`,
and pairing check precompiled contracts on the `alt_bn128` elliptic curve, which and pairing check precompiled contracts on the `alt_bn128` elliptic curve.
should be reflected in reduced gas costs.
What is more, the performance boost for those operations can be also observed
for Parity client.
Faster operations on Ethereum clients should be reflected in reduced gas costs.
## Motivation ## Motivation
@ -29,20 +33,30 @@ note](https://github.com/ethereum/go-ethereum/pull/16301#issuecomment-372687543)
the computational cost of `ECADD`, `ECMUL`, and pairing checks (excepting the the computational cost of `ECADD`, `ECMUL`, and pairing checks (excepting the
constant) has dropped roughly an order of magnitude across the board. constant) has dropped roughly an order of magnitude across the board.
Also, [optimisations in the bn library](https://github.com/paritytech/bn/pull/9)
used by the [Parity client](https://github.com/paritytech/parity-ethereum) led to a
significant performance boost we
[benchmarked](https://gist.github.com/pdyraga/4649b74436940a01e8221d85e80bfeef)
and compared against the [previous
results](https://github.com/ethereum/benchmarking/blob/master/constantinople/analysis2.md).
## Specification ## Specification
Following is a table with the current gas cost and new gas cost: Following is a table with the current gas cost and new gas cost:
| Contract | Address | Current Gas Cost | Updated Gas Cost | | Contract | Address | Current Gas Cost | Updated Gas Cost |
| ------------- | --------- | ----------------------------- | ------------------- | | ------------- | --------- | ----------------------------- | ------------------- |
| `ECADD` | `0x06` | 500<sup>[1]</sup> | 50 | | `ECADD` | `0x06` | 500<sup>[1]</sup> | 150 |
| `ECMUL` | `0x07` | 40 000<sup>[1]</sup> | 2 000 | | `ECMUL` | `0x07` | 40 000<sup>[1]</sup> | 6 000 |
| Pairing check | `0x08` | 80 000k + 100 000<sup>[2]</sup>| 5 500k + 80 000 | | Pairing check | `0x08` | 80 000 * k + 100 000<sup>[2]</sup>| 28 300 * k + 35 450 |
The gas costs for `ECADD` and `ECMUL` are updates to the costs listed in The gas costs for `ECADD` and `ECMUL` are updates to the costs listed in
EIP-196, while the gas costs for the pairing check are updates to the cost EIP-196, while the gas costs for the pairing check are updates to the cost
listed in EIP-197. listed in EIP-197. Updated gas costs have been adjusted to the less performant
client which is Parity, according to benchmarks<sup>[3]</sup>.
[1]- Per [EIP-196](https://github.com/ethereum/EIPs/blob/984cf5de90bbf5fbe7e49be227b0c2f9567e661e/EIPS/eip-196.md#gas-costs). [1]- Per [EIP-196](https://github.com/ethereum/EIPs/blob/984cf5de90bbf5fbe7e49be227b0c2f9567e661e/EIPS/eip-196.md#gas-costs).
[2]- Per [EIP-197](https://github.com/ethereum/EIPs/blob/df132cd37efb3986f9cd3ef4922b15a767d2c54a/EIPS/eip-197.md#specification). [2]- Per [EIP-197](https://github.com/ethereum/EIPs/blob/df132cd37efb3986f9cd3ef4922b15a767d2c54a/EIPS/eip-197.md#specification).
[3]- [Parity benchmarks.](https://gist.github.com/pdyraga/4649b74436940a01e8221d85e80bfeef)